[C++]统计程序运行的时间

Posted 2022-08-16 FL1623863129

auto t1=std::chrono::steady_clock::now(); 

//do something

auto t2=std::chrono::steady_clock::now();

//秒

double dr_s=std::chrono::duration<double>(t2-t1).count();

//毫秒级

double dr_ms=std::chrono::duration<double,std::milli>(t2-t1).count();

//微妙级

double dr_us=std::chrono::duration<double,std::micro>(t2-t1).count();

//纳秒级

double dr_ns=std::chrono::duration<double,std::nano>(t2-t1).count();